基于 AutoLayout 的应用程序中的 NSAutoresizingMaskLayoutConstraint 错误

Question

由于与 AutoLayout 相关的问题非常多，我不完全确定我在问一个新问题，但我就是无法让它发挥作用。我正在尝试使用 AutoLayout 为视图设置动画，但我在翻译它时已经失败了。在使用情节提要之前，我曾与 AL 合作过，这是我第一次尝试以编程方式使用它们。

所以，对于问题：从一个新创建的主从 iOS 应用程序开始，我从情节提要中删除了所有内容，插入了一个新的视图控制器并将其视图的类设置为 BaseView。基本视图代码如下：

class BaseView: UIView {
  @IBOutlet var secondaryView: UIView! = nil

  override func awakeFromNib() {
    setTranslatesAutoresizingMaskIntoConstraints(false)
    backgroundColor = UIColor.redColor()
    secondaryView = UIView(frame: frame)
    secondaryView.backgroundColor = UIColor.blueColor()
    addSubview(secondaryView)
    let views = ["secondaryView": secondaryView, "self": self]
    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-(100)-[secondaryView]", options: NSLayoutFormatOptions.AlignAllLeading, metrics: nil, views: views))
    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[secondaryView(==self)]", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
    addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[secondaryView(==self)]", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
  }
}

我还尝试通过情节提要的用户定义运行时属性将 translatesAutoresizingMaskIntoConstraints 设置为 false，但无济于事。我期望在模拟器的左侧看到一个红色方块（基本视图），而模拟器屏幕的其余部分则填充为蓝色。相反，一切都是蓝色的，日志给了我以下错误：

2014-08-20 22:19:00.392 AutoLayoutAnimationTest[5585:473139] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "<NSLayoutConstraint:0x7fa8c94b5f50 H:|-(100)-[UIView:0x7fa8c94b2540]   (Names: '|':AutoLayoutAnimationTest.BaseView:0x7fa8c94afa80 )>",
    "<NSAutoresizingMaskLayoutConstraint:0x7fa8c94bdfc0 h=--& v=--& UIView:0x7fa8c94b2540.midX == + 300>",
    "<NSAutoresizingMaskLayoutConstraint:0x7fa8c94be1d0 h=--& v=--& H:[UIView:0x7fa8c94b2540(600)]>"
)

Will attempt to recover by breaking constraint 
<NSLayoutConstraint:0x7fa8c94b5f50 H:|-(100)-[UIView:0x7fa8c94b2540]   (Names: '|':AutoLayoutAnimationTest.BaseView:0x7fa8c94afa80 )>

我不知道这些NSAutoresizingMaskLayoutConstraints 来自哪里，但据我了解，它们正在阻止secondaryView 移动。我做错了什么？

Answer 1

为 Swift 2 更新

通过假设 secondaryView 不存在于 Storyboard 中并且只是一个没有任何 IBOutlet 的属性，我能够使以下代码在没有任何调试器投诉的情况下工作：

class BaseView: UIView {
    //@IBOutlet var secondaryView: UIView! = nil
    var secondaryView: UIView!

    override func awakeFromNib() {
        backgroundColor = UIColor.redColor()

        secondaryView = UIView()
        secondaryView.translatesAutoresizingMaskIntoConstraints = false // Swift 2
        // secondaryView.setTranslatesAutoresizingMaskIntoConstraints(false) // Swift 1.2
        secondaryView.backgroundColor = UIColor.blueColor()
        addSubview(secondaryView)

        let views = ["secondaryView": secondaryView, "self": self]
        addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-(100)-[secondaryView]", options: NSLayoutFormatOptions.AlignAllLeading, metrics: nil, views: views))
        addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:[secondaryView(==self)]", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
        addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[secondaryView(==self)]", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
    }
}

因此，我认为下面的代码（非常简洁）相当于前面的代码：

class BaseView: UIView {
    var secondaryView: UIView!

    override func awakeFromNib() {
        backgroundColor = UIColor.redColor()

        secondaryView = UIView()
        secondaryView.translatesAutoresizingMaskIntoConstraints = false // Swift 2
        // secondaryView.setTranslatesAutoresizingMaskIntoConstraints(false) // Swift 1.2
        secondaryView.backgroundColor = UIColor.blueColor()
        addSubview(secondaryView)

        let views = ["secondaryView": secondaryView]
        addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-(100)-[secondaryView]|", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
        addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|[secondaryView]|", options: NSLayoutFormatOptions(0), metrics: nil, views: views))
    }
}